This commands the brushless motors to pump the heart faster or slower,it to feed more or less oxygen to the body and control blood pressure depending on the person’s level of activity. （ ） A.allow B.allowed C.allowing D.to allow

This commands the brushless motors to pump the heart faster or slower,it to feed more or less oxygen to the body and control blood pressure depending on the person’s level of activity. （ ） A.allow B.allowed C.allowing D.to allow

正确答案：C